Under-Display Fingerprint Sensor Groove Design
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Solution Overview
Problem
The existing under-screen fingerprint identification technologies face challenges due to the fragility and high cost of OLED screens, leading to increased complexity and cost, as well as low maintainability, when directly attaching fingerprint identification modules, and fail to meet the demand for ultra-thin electronic devices due to excessive module thickness.
Innovation Solution
A fingerprint identification apparatus is designed with a fingerprint sensor chip disposed in a groove on a substrate, which is attached to the middle frame of an electronic device, allowing the module to be positioned under the display screen without direct adhesion, reducing thickness and complexity, and utilizing an optical path design with micro lenses and filters for improved fingerprint detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fingerprint identification module is directly attached to the OLED screen, then the fingerprint identification function is achieved, but the OLED screen is easily damaged and the device complexity increases
Solution Approach 1:
The patent introduces a support plate as an intermediary component between the fingerprint identification module and the OLED screen. The support plate serves as a mediator that bears the mechanical stress and protects the fragile OLED screen from direct contact with the fingerprint module, thereby resolving the contradiction between achieving fingerprint identification and protecting the screen while simplifying the attaching process
Solution Approach 2:
The patent segments the fingerprint identification assembly into distinct components: the fingerprint identification module, the support plate, and the OLED screen. This segmentation allows the support plate to be independently designed and attached to the OLED screen, separating the protection function from the fingerprint identification function and reducing the overall attaching process complexity
2Reliability
If the fingerprint identification module is directly attached to the OLED screen, then the fingerprint identification function is achieved, but the cost increases and maintainability decreases
Solution Approach 1:
The support plate acts as a replaceable intermediary component that can be independently manufactured and attached. This design reduces manufacturing costs by allowing standardized production of the support plate and simplifies maintenance, as the fingerprint module can be replaced without damaging the expensive OLED screen, thereby resolving the contradiction between protection and ease of manufacture
Solution Approach 2:
The patent enables the fingerprint identification module to be easily discarded or replaced when damaged, while the expensive OLED screen and support plate are recovered and reused. This approach reduces overall device cost and improves maintainability by allowing selective replacement of only the disposable fingerprint module rather than the entire assembly
3Reliability
If the existing fingerprint identification module is used, then the fingerprint identification function is achieved, but the module thickness is excessive and ultra-thin device demand is not met
Solution Approach 1:
The patent extracts the fingerprint sensor chip from the traditional thick fingerprint identification module and positions it directly on the support plate. By removing unnecessary components and reducing the module's overall thickness while maintaining the core fingerprint sensing function, the design meets the demand for ultra-thin devices without sacrificing identification reliability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces the costs and complexity of electronic devices, enhances maintainability, and meets the demand for ultra-thin designs while providing effective fingerprint identification by minimizing contact with the fragile OLED screen and optimizing optical imaging.
Implementation Method 1
an optical fingerprint sensor, located under the display screen, configured to receive a fingerprint detecting signal returned by reflection via a human finger
Data Source
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AI summary
Provided are a fingerprint identification apparatus and an electronic device. The fingerprint identification apparatus is applicable to an electronic device having a display screen, and includes: a fingerprint sensor chip; and a substrate, where an upper surface of the substrate extends downward to form a first groove, and at least a portion of the fingerprint sensor chip is disposed in the first groove and electrically connected to the substrate. By disposing at least a portion of the fingerprint identification sensor in the first groove, not only could costs and complexity of the electronic device be reduced, but also a thickness of the fingerprint identification apparatus could be effectively reduced.